London J. Bot. 3: 536. 1844,.
Plants reddish to black. Leaves erect-spreading, straight or sometimes secund, lanceolate, widest proximally, apex symmetric; costa absent; leaf margins entire; basal laminal cells rectangular to long-rectangular, marginal cells quadrate, walls little pitted; medial laminal cells roundedquadrate to ovate, 1-stratose entirely or sometimes 2-stratose in patches distally, lumens rounded; laminal papillae rare, low. Sexual condition cladautoicous; perichaetial leaves differentiated, convolute-sheathing. Spores 12–20 (–30) µm.
Habitat: Acidic rock faces, occasionally thin soil
Elevation: moderate elevations
B.C., South America (Argentina), South America (Ecuador), nw Europe, Asia (e China), Atlantic Islands (Kerguelen Island), Pacific Islands (including New Zealand), Australia
"widest" is not a number.